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Blauberg Box-I 40x20 2E

Centrifugal fans in sound-insulated casing for rectangular ducts. Maximum air flow up to 1070 m³/h.
EAN codeEAN4058448076916
  • Description
  • Characteristics
  • Capacity diagram
  • Downloads
  • Dimensions
  • Additional characteristics
  • Designation key
  • Accessories

Supply and exhaust ventilation systems installed in various premises.Compatible with 400x200 up to 600x350 mm rectangular air ducts.

Smooth speed control with an external thyristor controller or step speed control with an external auto transformer (both available upon separate order).


Atmospheric resistant galvanized steel casing and impeller.The casing is heat- and sound-insulated with 50 mm mineral wool.The fan is rated for continuous operation.Fitted with standard 20 mm connecting flanges for connection to rectangular air ducts.Access cover on the casing for inspection and maintenance operations.The fan is equipped with a built-in terminal box with a leaded outside sealed electrical lead-in for connection to power mains.

The fan is designed for mounting inside rectangular air ducts and can be installed in any position.The fan flanges are connected to the air ducts through the bolts inserted into the flange holes.The fan is suitable for mounting into round duct at intake flange with a round reducer (available upon separate order).If vibration-absorbing flexible connectors are used to connect the fan to the air ducts provide their fixation to mounting structures with supports or brackets.While mounting provide enough space for accessing the cover for service operations.


Two- or four-pole asynchronous motor with external rotor and centrifugal impeller with backward curved blades.Single-phase (E) or three-phase (D) motor modifications.Equipped with ball bearings for longer service life.Dynamically balanced impeller.Overheating protection by built-in thermal switches with automatic restart or with leaded outside terminals for connection to external protecting controls.The thermal switch terminal leads are designed for connection to respective circuit of the contacter, overload relay or respective terminals of the autotransformer or thyristor speed controller.

Parameter Box-I 40x20 2E
50 Hz
Box-I 40x20 2E
60 Hz
Measurement unit
Voltage 230 230 V
Phase 1 1 ˜
Frequency 50 60 Hz
Power 138 200 W
Current 0.6 0.88 A
RPM 2600 2850 min-1
Maximum air flow 930 1070 m³/h
Maximum air flow 258 297 l/s
Sound pressure level at 3 m 45 47 dBА
Motor IP rating IP44 IP44 -
Transported air temperature -25…+45 -25…+45 °С
Ingress protection rating IPX4 IPX4 -
Casing material galvanized steel galvanized steel -
Air duct for rectangular air ducts for rectangular air ducts -
Design centrifugal centrifugal -
Type Exhaust, Supply Exhaust, Supply -
Weight 24.5 24.5 kg
Mounting Inline Inline -
ErP 2018 2018 -
Capacity diagram
Capacity diagram
  • Selection method:
  • Air capacity:
  • Pressure:
Operating point
  • Air capacity: --
  • Pressure: ---
Documents archieve
Documents archieve
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Box - user's manual (pdf 3.76Mb)
Box-I - data sheet (pdf 936.71Kb)
Box-I - image (png 529.99Kb)

Type Dimensions [mm]
B B1 B2 B3 H H1 H2 H3 L
Box-I 40x20 2E 400 420 440 500 200 220 240 360 500
Additional characteristics
Additional characteristics
Sound power level, A-weighted Total Octave frequency bands [Hz] LpA 3 m LpA 1 m
63 125 250 500 1000 2000 4000 8000
LwA to inlet [dBA] 75 64 70 70 66 61 61 58 51 54 64
LwA to outlet [dBA] 79 66 70 73 72 69 69 68 61 58 68
LwA to environment [dBA] 66 42 54 61 60 61 51 47 37 45 55
Designation key
Designation key
Series Flange size (width x height) [cm] Motor
Number of poles
Box-I 40x20; 50x25; 50x30; 60x30; 60x35 2; 4

E: single-phase
D: three-phase

Silencers Filter boxes Electric heaters Water heaters Air dampers Gravity dampers Flexible antivibration connectors Speed controllers